A torque-stable wind power yaw brake and a wind power yaw device

Abstract

The utility model discloses a kind of wind power yaw brakes of stable torque and a kind of wind power yaw equipment, it is related to electromagnetic brake structure field, wind power yaw brake of stable torque includes friction disc and brake assembly;First friction surface is provided on the brake assembly, step is provided on the first friction surface, second friction surface is formed on the step;The step is located in the middle position of the first friction surface;The first friction surface or the second friction surface is used to carry out friction brake to the friction disc, and the same initial torque and final torque can be kept by the step and second friction surface of middle portion setting.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic brake structure, and in particular to a torque-stable wind power yaw brake and a wind power yaw device. Background Technology

[0002] An electromagnetic brake consists of components such as a magnetic yoke, coil, armature, braking assembly (brake disc), main spring, and gear sleeve. It is generally installed at the rear end of the motor to serve as a braking and position-holding device.

[0003] For general electromagnetic brakes, only the actual torque needs to be greater than the rated torque; the magnitude of the torque is not strictly required. However, wind turbine yaw brakes have strict torque requirements, generally requiring the actual torque to be ±10% to ±15% of the rated torque. This is mainly determined by the operating conditions of wind turbine yaw brakes. The wind turbine yaw device is driven by several drive motors, which in turn drive the large fan to rotate along the axis of the drive motors. The wind is unpredictable; a sudden crosswind deviating from the original direction requires the electromagnetic brake to slip, and the wind turbine yaw device to sway with the wind. This necessitates that the torque of the electromagnetic brake cannot be too high. If it is too high, the brake will not slip, the wind turbine yaw device will not be driven by the wind, and there is a risk of tooth breakage in the large gear of the yaw device. Similarly, the torque of the electromagnetic brake cannot be too low; if it is too low, it will not be able to stop the vehicle, which also does not meet the requirements. Therefore, the actual torque of the wind turbine yaw brake must be controlled within a certain range.

[0004] The friction surface of the braking component (brake disc) of the current wind turbine yaw brake has two forms: one is a flat friction surface, which is simple to manufacture but requires extremely high precision. If the friction surface of the brake disc is higher on the outside and lower on the inside, the initial torque will be much greater than the design torque due to the large friction radius, which can exceed the requirement by more than 25%. If the friction surface of the brake disc is lower on the outside and higher on the inside, the initial torque will be much less than the design torque due to the small friction radius, which can be less than the requirement by more than 25%. Secondly, there is the stepped surface of the friction surface, which is higher on the outside and lower on the inside. Most current wind turbine yaw brakes adopt this type, with the higher outer step surface generally accounting for about 50% of the total friction surface. The step height is generally 0.02mm to 0.1mm. While reducing the initial contact area can indeed partially reduce the initial torque range, even if the step surface is very flat, the initial torque of the brake will still be 10% to 20% greater than the torque after the step is worn down. This excessive initial torque does not meet the requirements for wind turbine yaw brakes. Because the friction radius is increased, this structure will not result in the initial torque being less than the design torque. However, the large initial torque also does not meet the requirements for wind turbine yaw brakes. Utility Model Content

[0005] This invention provides a wind power yaw brake with stable torque and a wind power yaw device, which can solve the problem that the initial torque and the final torque are not the same in the prior art.

[0006] To address the aforementioned problems, this utility model provides a torque-stable wind turbine yaw brake, comprising a friction disc and a braking assembly; The braking assembly is provided with a first friction surface, the first friction surface is provided with a step, and a second friction surface is formed on the step; The step is located at the middle of the first friction surface; The first friction surface or the second friction surface is used to perform friction braking on the friction disc.

[0007] The above structure, compared to the prior art, has the following beneficial effects, but is not limited to: By setting a step and a second friction surface in the braking assembly, the second friction surface preferentially contacts the friction disc during the initial braking phase, providing a stable initial torque. When the second friction surface wears down, the first friction surface participates in braking, making the final torque basically consistent with the initial torque, thus solving the problem of excessive deviation between the initial torque and the final torque in the prior art.

[0008] Preferably, the stepped ring is disposed on the side of the braking assembly facing the friction disc; Alternatively, the stepped ring may be arranged on both sides of the braking assembly; The second friction surface is higher than the first friction surface.

[0009] The above structure, compared to the prior art, has the following beneficial effects, but is not limited to: By setting the steps in a ring shape and arranging the first friction surfaces on both sides, the braking torque is ensured to be evenly distributed in the circumferential direction, further improving the stability of the torque.

[0010] Preferably, when the step is provided on both sides of the braking assembly, the step on the side of the braking assembly facing the friction disc is provided with a first inner diameter and a first outer diameter; The step on the side of the braking assembly away from the friction disc is provided with a second inner diameter and a second outer diameter.

[0011] Preferably, multiple steps are arranged in a row and radiating outwards on the braking assembly, and the multiple steps are arranged at equal intervals from the inside to the outside on the braking assembly.

[0012] The above structure, compared to the prior art, has the following beneficial effects, but is not limited to: By setting multiple outward-radiating steps arranged at equal intervals, multi-level frictional contact can be provided at different radius positions, optimizing torque distribution and adapting to braking requirements under different working conditions.

[0013] Preferably, multiple steps are arranged circumferentially on the braking assembly, and the multiple steps are arranged in a ring on the braking assembly and spaced apart.

[0014] The above structure, compared to the prior art, has the following beneficial effects, but is not limited to: By setting multiple ring-shaped, spaced steps, multiple independent friction zones are formed, improving the reliability of braking and the consistency of torque.

[0015] Preferably, the braking assembly includes a friction pad and a brake disc, the friction pad is disposed on the brake disc, and the first friction surface is disposed on the side of the friction pad away from the brake disc.

[0016] Preferably, two friction pads are provided, and the two friction pads are respectively located on both sides of the brake disc, and the step is provided on the side of the friction pad away from the brake disc.

[0017] Preferably, it also includes an armature, and the brake disc is mounted on the armature via the friction pad on one side.

[0018] Preferably, a transition surface is provided between the step and the first friction surface, and the transition surface connects the first friction surface and the second friction surface.

[0019] The above structure, compared to the prior art, has the following beneficial effects, but is not limited to: By setting a transition surface to connect the first friction surface and the second friction surface, the torque change is made smoother, avoiding torque jumps caused by sudden changes in the contact surface during braking, and enhancing the controllability and stability of the braking process.

[0020] Preferably, a wind turbine yaw device includes a torque-stabilized wind turbine yaw brake as described in any of the preceding claims.

[0021] In summary, compared with the prior art, the overall beneficial effects of this utility model are as follows: In this application, a step is provided on the friction plate, and a second friction surface located at the middle of the step can abut against the friction disc, so that the second friction surface contacts the friction disc first in the initial stage of braking to provide a stable initial torque. As the second friction surface gradually wears down, the symmetrically distributed first friction surfaces begin to participate in braking, so that the final torque is basically consistent with the initial torque. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of a torque-stabilized wind turbine yaw brake according to an embodiment of the present invention. Figure 2 This is an exploded structural diagram of a torque-stabilized wind turbine yaw brake according to an embodiment of the present invention. Figure 3 This is a cross-sectional structural diagram of the braking assembly according to an embodiment of the present utility model; Figure 4 This is a partial cross-sectional structural diagram of a torque-stabilized wind turbine yaw brake according to an embodiment of the present invention; Figure 5 This is a partial cross-sectional view of the friction plate according to another embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 100, Magnetic yoke; 200, Friction disc; 400, Braking assembly; 410, Friction pad; 411, First friction surface; 412, Step; 413, Second friction surface; 414, First inner diameter; 415, First outer diameter; 416, Second inner diameter; 417, Second outer diameter; 418, Transition surface; 420, Braking disc; 500, Armature. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0029] like Figures 1 to 5 As shown in the figure, the present invention provides a torque-stable wind turbine yaw brake, which mainly includes a magnetic yoke 100, a friction disc 200, a braking assembly 400, and an armature 500. The braking assembly 400 is mounted on the magnetic yoke 100 in conjunction with the armature 500. The braking assembly 400 is composed of a friction plate 410 and a braking disc 420. The friction plate 410 is configured as a flat, annular structure and is integrally connected to the braking disc 420 by welding to form the braking assembly 400. Two friction plates 410 are provided on one braking disc 420, and the two friction plates 410 are respectively located on both sides of the braking disc 420. A step 412 is provided on the friction plate 410, and the step 412 protrudes on the friction plate 410 to cooperate with the friction disc 200 for braking.

[0030] Specifically: As shown in the figure, a first friction surface 411 is formed on the side of the friction pad 410 away from the brake disc 420. In the prior art, the first friction surface 411 on the brake assembly 400 directly performs friction braking with the friction disc 200. In this application, a step 412 is provided in an annular shape on the side of the first friction surface 411 facing the friction disc 200. The step 412 is a ring structure, protruding from the first friction surface 411 and located in the middle of the first friction surface 411, so that the first friction surface 411 is provided on both sides of the step 412. A second friction surface 413 is formed on the side of the step 412 away from the first friction surface 411. The area of ​​the second friction surface 413 is less than or equal to the area of ​​the first friction surface 411 or greater than or equal to the area of ​​the first friction surface 411, and the second friction surface 413 is higher than the first friction surface 411. The second friction pad 410 is used to cooperate with the friction pad 410 to perform friction braking.

[0031] Specifically: When the brake disc 420 engages with the friction pad 410 to brake the friction disc 200, the step 412, located on the side of the friction pad 410 facing the friction disc 200, firstly rubs against the friction disc 200 through the second friction surface 413 on the step 412. Since the step 412 is located in the middle of the friction pad 410, its initial torque remains constant. When the friction disc 200 grinds the second friction surface 413 on the step 412, the first friction surfaces 411 on both sides of the friction pad 410 form a single first friction surface 411. The friction disc 200 applies friction braking to the first friction surfaces 411 on both sides. Since the first friction surface 411 is initially symmetrical about the step 412 on the friction pad 410, its torque remains relatively stable. The final torque after braking will be approximately the same as the initial torque without significant deviation, thus avoiding torque instability.

[0032] In this embodiment of the application, the height of the step 412 protruding from the first friction surface 411 is controlled between 0.02mm and 0.1mm, preferably between 0.05mm, so that during the friction process, the deviation between the initial force and the final torque is controlled within 10%, and further controlled within 5%.

[0033] Meanwhile, within the braking assembly 400, there are two friction pads 410. These two friction pads 410 are respectively located on both sides of the brake disc 420. Preferably, in this embodiment, the step 412 is provided on the friction pad 410 on the side of the brake disc 420 facing the friction disc 200, so that the brake disc 420 directly frictionally brakes with the friction disc 200 through the step 412.

[0034] Preferably, in this embodiment of the application, steps 412 may be provided on both sides of the friction pads 410 of the brake disc 420, or steps 412 may be provided only on the side of the brake disc 420 facing the friction disc 200.

[0035] In the above structure, when the step 412 is provided on the brake disc 420 facing the friction disc 200, the step 412 at this position is provided with a first inner diameter 414 and a first outer diameter 415, and the size of the first inner diameter 414 is smaller than the size of the first outer diameter 415. When the step 412 is located on the side of the brake disc 420 away from the friction disc 200, the step 412 at this location is provided with a second inner diameter 416 and a second outer diameter 417, the size of the second inner diameter 416 being smaller than the size of the second outer diameter 417.

[0036] In this embodiment, the first inner diameter 414 is equal to the second inner diameter 416, and the first outer diameter 415 is equal to the second outer diameter 417, so that the torque on both sides of the brake disc 420 can remain basically the same, thus avoiding sudden changes in torque.

[0037] Preferably, in this embodiment of the application, the size of the first inner diameter 414 and the size of the second inner diameter 416, and the size of the first outer diameter 415 and the size of the second outer diameter 417 can be different, such that the size of the first inner diameter 414 is smaller or larger than the size of the second inner diameter 416, and the size of the first outer diameter 415 is smaller or larger than the size of the first outer diameter 415, as long as the corresponding inner and outer diameters can keep the initial torque and the final torque the same.

[0038] Meanwhile, this application provides an armature 500, which is located on the side of the brake disc 420 away from the friction disc 200. The brake disc 420 is mounted on the armature 500 via a friction pad 410 on one side, forming a brake.

[0039] In this application embodiment, based on the above structure, multiple embodiments are also provided. These multiple embodiments further improve the configuration of the first friction surface 411 and the second friction surface 413. Specifically, in one embodiment, multiple steps 412 are provided, and the multiple steps 412 are a short arc-shaped structure. The center of the arc-shaped structure is the center of the friction plate 410, so that the multiple steps 412 are arranged in a ring around the center of the friction plate 410 at intervals. Each step 412 has a corresponding second friction surface 413 and a first inner diameter 414 and a first outer diameter 415, and the first inner diameter 414 and the first outer diameter 415 of the multiple steps 412 are the same.

[0040] This application also provides an embodiment in which multiple steps 412 are arranged side by side in a radial direction from the inside out, and the multiple steps 412 are arranged at equal intervals from the inside out on the braking assembly 400. Under this structure, the initial torque and the final torque can also be the same.

[0041] Furthermore, this application also provides an embodiment in which, as shown in the example... Figure 5 As shown, a transition surface 418 is provided between the step 412 and the first friction surface 411. The transition surface 418 can connect the first friction surface 411 and the second friction surface 413. In this embodiment, the transition surface 418 is set as an arc-shaped structure. By setting the transition surface 418, the torque change of the friction plate 410 during friction braking with the friction disk 200 can be smoother, avoiding sudden torque changes and further improving torque stability. At the same time, this arc-shaped transition surface 418 can also reduce stress concentration during the friction process and extend the service life of the friction plate 410.

[0042] Finally, this application also provides a wind turbine yaw device, which includes any of the above-mentioned torque-stable wind turbine yaw brakes. By applying such a torque-stable wind turbine yaw brake to the wind turbine yaw device, the wind turbine yaw device can be made more stable and reliable during operation, effectively improving the overall performance of the wind turbine yaw device.

[0043] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A torque-stable wind turbine yaw brake, characterized in that, Includes a friction disc (200) and a braking assembly (400); The braking assembly (400) is provided with a first friction surface (411), a step (412) is provided on the first friction surface (411), and a second friction surface (413) is formed on the step (412). The step (412) is located at the middle of the first friction surface (411); The first friction surface (411) or the second friction surface (413) is used to perform friction braking on the friction disc (200).

2. The torque-stabilized wind turbine yaw brake according to claim 1, characterized in that, The step (412) is arranged in a ring on the brake assembly (400) on one side facing the friction disc (200); Alternatively, the step (412) may be arranged in a ring on both sides of the braking assembly (400); The second friction surface (413) is higher than the first friction surface (411).

3. The torque-stabilized wind turbine yaw brake according to claim 2, characterized in that, When the step (412) is located on both sides of the brake assembly (400), the step (412) on the side of the brake assembly (400) facing the friction disc (200) is provided with a first inner diameter (414) and a first outer diameter (415). The step (412) on the side of the braking assembly (400) away from the friction disc (200) is provided with a second inner diameter (416) and a second outer diameter (417).

4. The torque-stabilized wind turbine yaw brake according to claim 2, characterized in that, Multiple steps (412) are arranged in a row and radiate outwards on the braking assembly (400), and the multiple steps (412) are arranged at equal intervals from the inside to the outside on the braking assembly (400).

5. The torque-stabilized wind turbine yaw brake according to claim 2, characterized in that, Multiple steps (412) are arranged circumferentially on the braking assembly (400), and the multiple steps (412) are arranged in a ring shape and spaced apart on the braking assembly (400).

6. The torque-stabilized wind turbine yaw brake according to any one of claims 4 or 5, characterized in that, The braking assembly (400) includes a friction pad (410) and a brake disc (420). The friction pad (410) is disposed on the brake disc (420), and the first friction surface (411) is disposed on the friction pad (410) on a side away from the brake disc (420).

7. The torque-stabilized wind turbine yaw brake according to claim 6, characterized in that, Two friction pads (410) are provided, and the two friction pads (410) are respectively located on both sides of the brake disc (420). The step (412) is located on the side of the friction pad (410) away from the brake disc (420).

8. The torque-stabilized wind turbine yaw brake according to claim 7, characterized in that, It also includes an armature (500), and the brake disc (420) is mounted on the armature (500) via a friction plate (410) on one side.

9. The torque-stabilized wind turbine yaw brake according to claim 2, characterized in that, A transition surface (418) is provided between the step (412) and the first friction surface (411), and the transition surface (418) connects the first friction surface (411) and the second friction surface (413).

10. A wind turbine yaw device, characterized in that, Including the torque-stabilized wind turbine yaw brake as described in any one of claims 1 to 9.

Images